They "CLAIM" to have it.

N. Korea May Have Anti-Bird Flu Vaccine
North Korea has claimed it developed a poultry vaccine against the deadly H5N1 type of bird flu and is inoculating chickens as part of stepped-up efforts to prevent the disease following outbreaks in South Korea.
"The production of H5N1 vaccine locally developed recently in our country is increased and the compulsory vaccination of it to whole poultry flocks is being done," said Ri Kyong Gun, director of the North's Veterinary and Anti-Epidemic Department, in an interview with AP Television News in Pyongyang.
Ri did not say when the vaccine was developed or how effective it is.
[Forbes.Com]